[rbridge] MUST not send spanning tree BPDUs?

[Radia Perlman]

The spec currently says (in section 4.7.3.3 Transmission of BPDUs)

  RBridges MAY support a capability for sending spanning tree BPDUs for
   the purpose of attempting to force a bridged LAN to partition as
   discussed in Section A.3.3.  Except for this optional capability,
   RBridges MUST NOT send spanning tree BPDUs.


I don't remember any discussion on saying that RBridges MUST NOT send 
BPDUs. I remember
at one point requiring it, and saying that an RBridge is DRB if and only 
if it is the Spanning tree Root.
(I still would prefer that, by the way -- makes all the controversial 
per VLAN Hellos
unnecessary).

I remember it being removed from the spec (because of complexity with n 
versions of
spanning tree, and links with no bridges, perhaps, where the spanning 
tree messages would
be unnecessary overhead), but I don't remember any reason to say 
RBridges MUST NOT sent
BPDUs.

Anyone else remember?

Thanks,

Radia